1 // SPDX-License-Identifier: GPL-2.0-only
3 * Support for Partition Mobility/Migration
5 * Copyright (C) 2010 Nathan Fontenot
6 * Copyright (C) 2010 IBM Corporation
10 #define pr_fmt(fmt) "mobility: " fmt
12 #include <linux/cpu.h>
13 #include <linux/kernel.h>
14 #include <linux/kobject.h>
15 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/stat.h>
18 #include <linux/completion.h>
19 #include <linux/device.h>
20 #include <linux/delay.h>
21 #include <linux/slab.h>
22 #include <linux/stringify.h>
24 #include <asm/machdep.h>
27 #include "../../kernel/cacheinfo.h"
29 static struct kobject *mobility_kobj;
31 struct update_props_workarea {
38 #define NODE_ACTION_MASK 0xff000000
39 #define NODE_COUNT_MASK 0x00ffffff
41 #define DELETE_DT_NODE 0x01000000
42 #define UPDATE_DT_NODE 0x02000000
43 #define ADD_DT_NODE 0x03000000
45 #define MIGRATION_SCOPE (1)
48 static int mobility_rtas_call(int token, char *buf, s32 scope)
52 spin_lock(&rtas_data_buf_lock);
54 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
55 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
56 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
58 spin_unlock(&rtas_data_buf_lock);
62 static int delete_dt_node(__be32 phandle)
64 struct device_node *dn;
66 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
70 pr_debug("removing node %pOFfp\n", dn);
72 dlpar_detach_node(dn);
77 static int update_dt_property(struct device_node *dn, struct property **prop,
78 const char *name, u32 vd, char *value)
80 struct property *new_prop = *prop;
83 /* A negative 'vd' value indicates that only part of the new property
84 * value is contained in the buffer and we need to call
85 * ibm,update-properties again to get the rest of the value.
87 * A negative value is also the two's compliment of the actual value.
89 if (vd & 0x80000000) {
95 /* partial property fixup */
96 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
100 memcpy(new_data, new_prop->value, new_prop->length);
101 memcpy(new_data + new_prop->length, value, vd);
103 kfree(new_prop->value);
104 new_prop->value = new_data;
105 new_prop->length += vd;
107 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
111 new_prop->name = kstrdup(name, GFP_KERNEL);
112 if (!new_prop->name) {
117 new_prop->length = vd;
118 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
119 if (!new_prop->value) {
120 kfree(new_prop->name);
125 memcpy(new_prop->value, value, vd);
130 pr_debug("updating node %pOF property %s\n", dn, name);
131 of_update_property(dn, new_prop);
138 static int update_dt_node(__be32 phandle, s32 scope)
140 struct update_props_workarea *upwa;
141 struct device_node *dn;
142 struct property *prop = NULL;
146 int update_properties_token;
150 update_properties_token = rtas_token("ibm,update-properties");
151 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
154 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
158 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
164 upwa = (struct update_props_workarea *)&rtas_buf[0];
165 upwa->phandle = phandle;
168 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
173 prop_data = rtas_buf + sizeof(*upwa);
174 nprops = be32_to_cpu(upwa->nprops);
176 /* On the first call to ibm,update-properties for a node the
177 * the first property value descriptor contains an empty
178 * property name, the property value length encoded as u32,
179 * and the property value is the node path being updated.
181 if (*prop_data == 0) {
183 vd = be32_to_cpu(*(__be32 *)prop_data);
184 prop_data += vd + sizeof(vd);
188 for (i = 0; i < nprops; i++) {
191 prop_name = prop_data;
192 prop_data += strlen(prop_name) + 1;
193 vd = be32_to_cpu(*(__be32 *)prop_data);
194 prop_data += sizeof(vd);
198 /* name only property, nothing to do */
202 of_remove_property(dn, of_find_property(dn,
208 rc = update_dt_property(dn, &prop, prop_name,
211 printk(KERN_ERR "Could not update %s"
212 " property\n", prop_name);
222 } while (rtas_rc == 1);
229 static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
231 struct device_node *dn;
232 struct device_node *parent_dn;
235 parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle));
239 dn = dlpar_configure_connector(drc_index, parent_dn);
241 of_node_put(parent_dn);
245 rc = dlpar_attach_node(dn, parent_dn);
247 dlpar_free_cc_nodes(dn);
249 pr_debug("added node %pOFfp\n", dn);
251 of_node_put(parent_dn);
255 int pseries_devicetree_update(s32 scope)
259 int update_nodes_token;
262 update_nodes_token = rtas_token("ibm,update-nodes");
263 if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
266 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
271 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope);
275 data = (__be32 *)rtas_buf + 4;
276 while (be32_to_cpu(*data) & NODE_ACTION_MASK) {
278 u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK;
279 u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK;
283 for (i = 0; i < node_count; i++) {
284 __be32 phandle = *data++;
289 delete_dt_node(phandle);
292 update_dt_node(phandle, scope);
296 add_dt_node(phandle, drc_index);
311 void post_mobility_fixup(void)
314 int activate_fw_token;
316 activate_fw_token = rtas_token("ibm,activate-firmware");
317 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
318 printk(KERN_ERR "Could not make post-mobility "
319 "activate-fw call.\n");
324 rc = rtas_call(activate_fw_token, 0, 1, NULL);
325 } while (rtas_busy_delay(rc));
328 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
331 * We don't want CPUs to go online/offline while the device
332 * tree is being updated.
337 * It's common for the destination firmware to replace cache
338 * nodes. Release all of the cacheinfo hierarchy's references
339 * before updating the device tree.
341 cacheinfo_teardown();
343 rc = pseries_devicetree_update(MIGRATION_SCOPE);
345 printk(KERN_ERR "Post-mobility device tree update "
352 /* Possibly switch to a new RFI flush type */
353 pseries_setup_rfi_flush();
355 /* Reinitialise system information for hv-24x7 */
356 read_24x7_sys_info();
361 static ssize_t migration_store(struct class *class,
362 struct class_attribute *attr, const char *buf,
368 rc = kstrtou64(buf, 0, &streamid);
373 rc = rtas_ibm_suspend_me(streamid);
376 } while (rc == -EAGAIN);
381 post_mobility_fixup();
387 * Used by drmgr to determine the kernel behavior of the migration interface.
389 * Version 1: Performs all PAPR requirements for migration including
390 * firmware activation and device tree update.
392 #define MIGRATION_API_VERSION 1
394 static CLASS_ATTR_WO(migration);
395 static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION));
397 static int __init mobility_sysfs_init(void)
401 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
405 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
407 pr_err("unable to create migration sysfs file (%d)\n", rc);
409 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr);
411 pr_err("unable to create api_version sysfs file (%d)\n", rc);
415 machine_device_initcall(pseries, mobility_sysfs_init);